Evidence regarding what went on in mediation is inadmissible in arbitration. That allows folks to talk candidly with the mediators about their actions and feelings without that information being thrown up to them later.  This is pretty much standard procedure anywhere mediation is used.

Fred Bauder, member of the arbitration committtee

From: Anthere <anthere8@yahoo.com>
Reply-To: English Wikipedia <wikien-l@Wikipedia.org>
Date: Thu, 26 Feb 2004 08:59:34 -0800 (PST)
To: wikien-l@Wikipedia.org
Subject: [WikiEN-l] Where the power lies

Perhaps is it time to discuss which information can be offered from mediation to arbitration.
I have no memory of that ever to be discussed.
Should we offer a sort of a report to arbitration ?
Or nothing at all ?
Have you discussed the matter together ?